Portable power supply



FIG. 1 is a front, perspective view of a portable power supply showing our new design;

FIG. 2 is a rear, perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear perspective view thereof;

FIG. 5 is a left, side elevational view thereof;

FIG. 6 is a right, side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of the area “9” shown in FIG. 1 ;

FIG. 10 is an enlarged view of the area “10” shown in FIG. 1 ; and,

FIG. 11 is an enlarged view of the area “11” shown in FIG. 2 .

The broken lines depict portions of the portable power supply that form no part of the claimed design. 

CLAIM The ornamental design for a portable power supply, as shown and described. 